172 Bulletin Vanderbilt Marine Museum, Vol. VI 



acute tooth distally ; the first article is about half as long as the 

 rostrum; the second and third articles short, successively nar- 

 rowed ; the upper thick branch of the flagellum, with the first ring, 

 so large that it could easily be mistaken for the last peduncular 

 article, especially since the first peduncular article is almost con- 

 cealed dorsally ; this whip tapers considerably distally and is about 

 one or two rings longer than the scaphocerite ; the second whip is 

 one and one-half times as long as the first and much slenderer. 



The antennae have the basal article rather thick and broad, 

 dorsally a little rounded and terminating at the outer distal angle 

 in a tooth which is in line with the antennal tooth ; the scapho- 

 cerite is quite large, extending as far forward as midway the 

 carpus of the extended great cheliped and is nearly straight on 

 the outer lateral margin, slightly flared outward near the acute, 

 subdistal tooth ; the inner lateral margin is constricted proximally, 

 rather widely rounded for the greater part of its length, tapered 

 a little distally, the distal margin evenly rounded, crenulate and 

 ciliate. The second and third articles are thick, cylindrical, to- 

 gether not quite half of the length of the scaphocerite ; the flagel- 

 lum is composed of longish, coarse rings and is nearly twice the 

 length of the scaphocerite. 



The external maxillipeds are very slender, with the predistal 

 and distal articles of the endognath quite slender ; the exognath is 

 as wide as the predistal article of the endognath and extends to 

 midway the distal article, and is tipped with spinose bristles. 



The first pair of chelipeds are slender, stick-like, each reflexed 

 upon itself from the rneral-carpal joint ; the ischium is half as long 

 as the merus and somewhat laminate, being about twice as wide 

 as the merus, which is very narrow, cylindrical, reaching as far 

 forward as the antennal peduncle, but of distinctly less diameter ; 

 the reflexed carpus is as long as the merus, but slenderer; the 

 propodus, dactyl included, is two-thirds as long as the carpus, 

 slenderer; the very weak subequal dactyli, each being one-third 

 of the total propodal length, the tips fuzzy with outstanding short 

 setae. When extended, the first pair of legs reach to about one- 

 third of the length of the palm of the great cheliped. 



The second pair of chelipeds, when extended, is nearly as 

 long as the entire body of the shrimp. The basis and ischium are 

 each short, but successively widened distally; the merus is en- 

 larged, extending as far forward as the tip of the scaphocerite. 



